Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 5343980 | Child/parent play ladder A ladder which makes it possible for one person to climb onto another, particularly, a ladder which can be worn by an adult for the purpose of enabling a child to climb up the ladder and onto the adult. The top portion of the ladder is attached to a harne... | 09/06/1994 |
| 5255757 | Collapsible ladder The present invention provides a portable collapsible ladder that is easily secured onto a vehicle or structure mounted on a vehicle, such as a roof-top rack, to provide ease of access to the upper portion of the vehicle. The ladder of the present inventi... | 10/26/1993 |
| 4919182 | Motor vehicle emergency tire traction improvement device consisting of polymeric rope An emergency motor vehicle tire traction improving device for attachment or mounting to a conventional motor vehicle tire is made substantially totally of multi-strand polymeric plastic rope and includes three or more separate lengths of the rope connecte... | 04/24/1990 |
| 4852688 | Collapsible ladder assembly A collapsible ladder assembly for emergency exit from a building is secured to a window opening by a pair of anchoring hooks and includes two pairs of spaced-apart flexible rail members which support both a generally rectangular top step and a generally r... | 08/01/1989 |
| 4683981 | Molded hard elastomer steps and replacement and spreader steps for rope ladders and fittings therefor, as well as molding method therefor A rope ladder of the type having two spaced-apart pairs of ropes, has a metal frame for each step and has tubular nylon members with cylindrical bores, extending vertically through sets of through openings in the metal frame for assuring accurate bolt ali... | 08/04/1987 |
| 4554996 | Rope ladder with molded hard elastomer steps and replacement steps and collars therefor A rope ladder in which the steps have a metal frame comprising a pair of longitudinal members joined by a pair of shorter transverse members spaced in from the ends and strengthened by a pair of diagonal members. At each end a metal bracket bridges across... | 11/26/1985 |
| 4442920 | Collapsible ladder A collapsible ladder which includes a plurality of platforms suspended from several rope segments. The rope segments are placed in open-ended notches disposed in the platforms and are clamped thereto by a plurality of clamp means, the clamp means being di... | 04/17/1984 |
| 4241809 | Rope ladder with molded hard elastomer steps and a method for assembly of the same A rope ladder. Each step is a molded one-piece hard elastomer member having a pair of rope-receiving openings, the upper outlet from which closely confines a pair of ropes, while the bottom of the opening is much wider. Each opening tapers inwardly from b... | 12/30/1980 |
| 4177878 | Rope ladder A rope ladder in which a pair of bolted-together wedge collars and a wedge heart act upon a pair of ropes at each side of each step, to wedge themselves to the rope so that they and their step are locked firmly in place, relative to the rope.... | 12/11/1979 |
